Apparatus for producing, separating, and feeding powdered coal



Ma?. Z, 31.923.. l

- E. H. ELZEMEYER ET AL APPARATUS FOR PRODUCING,

, y AND FEEDING POWDERED COAL SEPAR 'ATING Filed Aug.

Patented Zit,

inter PAUL S KNETTEL, ST. L'IS, MESSUR.

Application ed August i, i921.

lo State of li/iissouri, lieve invented a new and useful improvement inApparatus for Prodnci'ng, Sepdrziting, and Feeding PowderedCosLvoiEwnicii tlie Jfoilovving is o specicotion..

This invention relates principally to apparntns for producing,separating and Jfeedin@ powdered cosi wherein the powdered '25 cosi isproduced in a rotary grinder and is removed tiieretroin and fed to thefurnace oy nieens of oir currents.

@ne oi the principal objects of the present invention is to provide esimple and efficient nienns 'loi' regnieting the air currents, whereby einei of the desired tineness and qnenmj/ may oloteined. @ther objectsare to increase tire output of powdered cosi,

eliminate tire use oi" dust collectors heretoi'- re coinnioniy used, tosimplify the construction nnd to reduce the cost of mannectnre idoperation. 'i-lie invention con! siste in construction, arrangement andf J ons of parts hereinafter described reed.

eccoinpenying drawing, which -t oi' this specification, andWheresymlools reifer to like parts Wherever they occur,

s a-verticnl section through ein l etes ein'oodyiifonr invention; end

. is e perspective View of the siintterv'or regni ""ng the oir current.

ing to accompanying dren-fing, eretus comprises n rotnry grinder "teforni ot ring pniverizer teioiy supp i spiced spiders treft/ed thereon."Elie rel o i3 extending nrrns ot the spiders 5 are connected tr .fouter ends by o series of sdieily spaced psrsiiel rods n. Looseiv sortedon rods 6 are grinding rings cooperete with the conceive grindoce ofcasing to pnlverize tire portieri orn trie iront. Weit ot e nisterioiniet opening 3t i having iongitndinslly' 8 which communicates with thelower end ot the feed chute of a. hopper 9; and said chute isprovidedwitli s gate 10 for cutting oil the How of the materiel to thegrinder. 1f desired :in automatic ieed hopper ot the kind shown inlnittel Patent No. 1,318,389 dated ctober 141, 1919, may be substitutedfor the hopper shown.

The top Wall of the casing is provided with an outlet opening 11 whichcommunicotes with the lower end of e vertically disposed pipe 12.Arranged between the me.- teriol inlet opening 8 and the outlet opening11 is on apron or deiiector in the form of en inclined plete 13, Whoselower `front edge is hinged to the front Weil of the casing 3 adjacentto the upper edge of said inlet opening. The iront edge of the apron 13ter-A minetes adjacent to the curved rear Weil of the casing 3. Thefront edge of the apron is adapted to cooperate with the inner sur-:tace of the curved portion of the rear Well of the casing to cut offcommunication between the pipe 12 and the `grinding ares of the casing 3or to form an opening thereA between of varying Width, the width of saidopening depending on the angular position of the apron, which swings inen arc Whose radius is iess than the radins ot the curved portion of thecasing. The apron is edj usted by means oi e sector 14C which llas oneend xed to seid apron. The ree end ot the sector extends through e, slotin the rear Wadi ot the casing 3 and is provided with s series oi holesadopted to receive s, pin whereiiy the apron may be supported in thedesired adjusted position. The apron 13 is provided, adjacent to itslower hinged endl, with en opening 15, the purpose of vvliiclx willhereinafter appear.

'lilie upper end ot' the pipe 12, which leeds from the top of the easing3, opens into the lower end oi en expansion or separating1 chamber inthe *forni ot e, casing 16 of larger te@ ores than the pipe 12.' Theupper end of the expansion chamber coinnlnnicotes with the lower end ofe pipe 17 whose upper end opens into n ton-bionerl, ond seid ten, inturn, is provided with n pipe 1S, which leeds to the `urnece (notshown).

Within the uppermost pipe 1'? is iocsted s control valve comprisingcounterpart beltsinitters in the form of hollow tapering helicones 20W'nose lower ends are snbssnntieily sernicircular and ere hingedtogether and Whose ripper ends terminate in o point. The

curved half sections 20 are pivotally 'supported in the pipe by thepivots 21, which hingedly secure said sections together, and areprovided with sector arms 22 similar to the sector arni 1l of the apron13, whereby said halves may be separated or broughttogether to controlthe iow of air and inaterial through the passageway'in the pipe 17. Thefan is provided with a suitable air valve 22, whereby air may besupplied to the fan to reduce the suction created thereby in thepassageway 23 formed by the pipe 12. expansion chamberl and pipe 17.

The expansion chamber 16 is preferably provided with a hinged apron ordeiector plate 24 having an actuating sector This apron is hinged to thefront wall ot' the chamber, which is provided with an inclined sackingspout 25a. rl`he lower end of said spout is closed by means ot' a cap Anauxiliary hopper 27 has an inclined spout which opens into the expansionchamber through 'the rear walll thereof at a point opposite to the apron24, This auxiliary hopper is adapted to receive powdered coal deliveredthereto in sacks troni the sacking spout. 25 and is provided with 'aicate for 'cutting oil the flow of the powdered coal to the expansionchamber.

The operation of the apparatus is as tollows: Lump coal is fed by thehopper 9 to the rotary grinder where it is engaged b v the rotatingrings 'i' and is pulverized. During the grinding operation the greaterpart of the pulverized coal is thrown upward by the circular motion ot'the rings against the inclined apron or detiector 13'. which causes theparticles to dropback into the path the rotating' rinus t3, rll`helarger particles that pass through the opening between the apron and thecasing; :tall baclr upon unper surface ot the downwardly inciined plate13 and drop through the opening l? near thev hinged end ot the' apronintoI the path oi" rotating' rings. The suction created by thertan 18 inthe passageway 2S euses finer particles of coal to be drawn through theopening' between the free ed ot apron 1% and the curved portion otthefcasingf 3 and thence through the lowermostpipe 12 into the expansionchamber 16. This expansion chamber., by reason larger area.l has theeffect ot decreasing the velocity oiC the air currents produced by 'thesuction of the tan 18, thereby causngg the heavier particles to 'leali'back the grinder. The 'tine particles then drawn upwardly through theshutter-valve 2G into the fan 18 are delivered thereby the pipe to 'thefurnace. The vaive 20 senves as a battle and can be adjusted to peru mitonly the finest particles to enter the Lian., This valve also controlsthe amount ot `Fine dust permitted to enter saidV The size and quantityof pulverized material permitted to enter the expansion chamber 16 isregulated by adjusting the hinged apron or baille plate 13.

During the operation ot' the apparatus, the apron 24 within theexpansion chamber may be lowered to nearly close said chamber, therebyformingr a pocket in which the fine coal dust will be collected. Thisdust is lthen drawn otf through the spout 25 into sacks and deposited inthe auxiliary feed-hopper 7' 2T. With this arrangement, in the event ot'an accident to the pulverizer. the gate 28 in the spout of the auxiliaryvfeed-hopper 2T can be opened. and the reserve material therein usedwithout interfering with the operation of the apparatus.

Obviously, the invention admits of considerable modification withoutdeparting from the invention: thereiore` we do not wish to be restrictedto the'particular forms and arrangements shown in the drawing.

W'hat we claim is:

1. A n apparatus of the kind described comprlsing a grinding devicehaving an inlet opening and an outlet opening:` a feed hoppercommunicating with said inlet opening. a passageway' leadingI Jfrom saidoutlet openiiigi and suction means for creating an an" current in saidpassageway, and a control valve located in said passageway said valvecomprising la plurality of curved lf-sliaped plates Whose base portionshinged together5 whereby said plates are ada. ted to be separated andbrought to(` .her to control the tio'iv'ot' air and through said la@passageway.

2. in apparatus of comprising; a pulverisi o.

Utl

passage d rising device an openingn width, saidA ningecl f" reinadiacent the-recit for returning tle ci the grinding area UL 3. anapparatus oi lincl comprising a pulverisingj device inlet pening and anoutlet op hopper7 'communicating 'with said i.

oeserined having A ing, a passageway leading from said outlet opening,suction means for creatinglan air current in said' passageway, wherebythe pulverized material is withdrawn from said pulverizing devicethrough the passageway, said passageway having an enlarged portionbetween said outlet and said suction means. whereby the line materialupon reaching the enlarged portion of said passageway is separated fromthe coarse material which drops back into said pulveriziug device. andadjustable means located in said passageway between said charnber andsaid suction device constituting a regulator for the'air current, adeflector for the heavier material and a cut-off for the passageway`said adjustable means comprising a pair ot' curved V-shapcd plateswhosebase portions are hinged together and are pivotally supported withinsaid passageway.

4. An apparatus of the kind described comprising a grinding device,having an inlet opening and an outlet opening, a feedhoppercommunicating with said inlet opening, ati-passageway leading from saidoutlet opening, .suction means for creating an Vair Current in saidpassageway, whereby the pulverized material is withdrawn from saidgrinding, device through the passageway, said passageway having anenlarged portion between said outlet and said suction means, whereby thefine material upon reaching the enlarged portion of said passageway isseparated from the coarse material which drops back into saidpulverizing device, an auX- iliary feed-hopper communicating with theenlarged portion of said passageway, a sacking spout leading from saidenlarged portion` and a hinged deflector located in said enlargedportion adjacent to said sacking spout, said deector being adapted toform a pocket in which the pulverized material is collected, wherebysaid material is adapted to be drawn off through said spout anddeposited in said auxiliary feed-hopper and constitutes a reserve supplyof pulverized material.

Signed at St. Louis, Missouri, this 29th day of July, 1921.-

ERNST H. ELZEMEYER. PAUL KNliTTEL.

